Changes between Version 5 and Version 6 of jazz/10-05-30

Timestamp:

May 30, 2010, 11:46:55 PM (15 years ago)

Author:

jazz

Comment:

--

jazz/10-05-30

@@ -35 +35 @@
 sun-java6-jre   sun-java6-jre/stopthread        select  true
 }}}
+
+== Shell Script ==
+
+ * 如何在 shell script 裡面把標準輸入跟標準輸出重新導向到另一個路徑呢?!
+   * [參考] [http://www.linuxquestions.org/questions/linux-general-1/shell-scripting-how-to-redirect-output-from-within-the-script-itself-446558/ Shell scripting: How to redirect output from within the script itself? ]
+{{{
+#!sh
+#! /bin/bash
+
+TARGET="target-file"
+
+# file descriptor 4 prints to STDOUT and to TARGET
+exec 4> >(while read a; do echo $a; echo $a >>$TARGET; done)
+# file descriptor 5 remembers STDOUT
+exec 5>&1
+
+# now STDOUT is redirected
+exec >&4
+date
+
+# wer're done
+exec >&5
+echo "Date sent to fd4."
+}}}